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https://www.readbyqxmd.com/read/28919044/susceptibility-of-colistin-resistant-pathogens-to-predatory-bacteria
#1
Sonal Dharani, Dong Hyun Kim, Robert M Q Shanks, Yohei Doi, Daniel E Kadouri
The increase in multidrug-resistant Gram-negative bacterial infections has forced the reintroduction of antibiotics such as colistin. However, the spread of plasmid-borne mcr-1 colistin resistance genes have moved us closer to an era of untreatable Gram-negative infections. To evaluate whether predatory bacteria could be used as a potential therapeutic to treat this upcoming threat, the ability of Bdellovibrio bacteriovorus and Micavibrio aeruginosavorus to prey on several clinically relevant mcr-1-positive, colistin-resistant isolates was evaluated...
September 14, 2017: Research in Microbiology
https://www.readbyqxmd.com/read/28874374/structure-and-dynamics-of-fosa-mediated-fosfomycin-resistance-in-klebsiella-pneumoniae-and-escherichia-coli
#2
Erik H Klontz, Adam D Tomich, Sebastian Günther, Justin A Lemkul, Daniel Deredge, Zach Silverstein, JoAnna F Shaw, Christi McElheny, Yohei Doi, Patrick Wintrode, Alexander D MacKerell, Nicolas Sluis-Cremer, Eric J Sundberg
Fosfomycin exhibits broad-spectrum antibacterial activity, and is being re-evaluated for the treatment of extensively drug-resistant pathogens. Its activity in Gram-negatives, however, can be compromised by expression of FosA, a metal-dependent transferase that catalyzes the conjugation of glutathione to fosfomycin, rendering the antibiotic inactive. In this study, we solved the crystal structures of two of the most clinically relevant FosA enzymes: plasmid-encoded FosA3 from Escherichia coli and chromosomally-encoded FosA from Klebsiella pneumoniae (FosA(KP))...
September 5, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28851843/widespread-fosfomycin-resistance-in-gram-negative-bacteria-attributable-to-the-chromosomal-fosa-gene
#3
Ryota Ito, Mustapha M Mustapha, Adam D Tomich, Jake D Callaghan, Christi L McElheny, Roberta T Mettus, Robert M Q Shanks, Nicolas Sluis-Cremer, Yohei Doi
Fosfomycin is a decades-old antibiotic which is being revisited because of its perceived activity against many extensively drug-resistant Gram-negative pathogens. FosA proteins are Mn(2+) and K(+)-dependent glutathione S-transferases which confer fosfomycin resistance in Gram-negative bacteria by conjugation of glutathione to the antibiotic. Plasmid-borne fosA variants have been reported in fosfomycin-resistant Escherichia coli strains. However, the prevalence and distribution of fosA in other Gram-negative bacteria are not known...
August 29, 2017: MBio
https://www.readbyqxmd.com/read/28851296/design-and-rationale-of-the-procalcitonin-antibiotic-consensus-trial-proact-a-multicenter-randomized-trial-of-procalcitonin-antibiotic-guidance-in-lower-respiratory-tract-infection
#4
David T Huang, Derek C Angus, Chung-Chou H Chang, Yohei Doi, Michael J Fine, John A Kellum, Octavia M Peck-Palmer, Francis Pike, Lisa A Weissfeld, Jonathan Yabes, Donald M Yealy
BACKGROUND: Overuse of antibiotics is a major public health problem, contributing to growing antibiotic resistance. Procalcitonin has been reported to be commonly elevated in bacterial, but not viral infection. Multiple European trials found procalcitonin-guided care reduced antibiotic use in lower respiratory tract infection, with no apparent harm. However, applicability to US practice is limited due to trial design features impractical in the US, between-country differences, and residual safety concerns...
August 29, 2017: BMC Emergency Medicine
https://www.readbyqxmd.com/read/28796408/use-of-the-anion-gap-and-intermittent-hemodialysis-following-continuous-hemodiafiltration-in-extremely-high-dose-acute-on-chronic-lithium-poisoning-a-case-report
#5
Yohei Komaru, Ryota Inokuchi, Yoshihiro Ueda, Masaomi Nangaku, Kent Doi
A 35-year-old woman intentionally took 40,000 mg of lithium carbonate, and she was transferred to our hospital with nausea, vomiting, and diarrhea. She was diagnosed as having bipolar disorder 10 years ago and was receiving oral lithium therapy. Blood test results on arrival were remarkable for a negative anion gap of -2.1 and later, the serum lithium level turned out to be as high as 15.4 mEq/L. Intubation was required because of disrupted consciousness, and continuous hemodiafiltration (CHDF) was immediately started in the intensive care unit to obtain constant removal of lithium...
August 10, 2017: Hemodialysis International
https://www.readbyqxmd.com/read/28782704/geographical-variation-in-therapy-for-bloodstream-infections-due-to-multidrug-resistant-enterobacteriaceae-a-post-hoc-analysis-of-the-increment-study
#6
Patrick N A Harris, M Diletta Pezzani, Belén Gutiérrez-Gutiérrez, Pierluigi Viale, Po-Ren Hsueh, Patricia Ruiz-Garbajosa, Mario Venditti, Mario Tumbarello, Carolina Navarro-Francisco, Esther Calbo, Murat Akova, Helen Giamarellou, Antonio Oliver, Benito Almirante, Oriol Gasch, Luis Martínez-Martínez, Mitchell J Schwaber, George Daikos, Johann Pitout, Carmen Peña, Alicia Hernández-Torres, Yohei Doi, Federico Pérez, Felipe Francisco Tuon, Evelina Tacconelli, Yehuda Carmeli, Robert A Bonomo, Álvaro Pascual, David L Paterson, Jesús Rodríguez-Baño
We aimed to describe regional differences in therapy for bloodstream infection (BSI) caused by extended-spectrum β-lactamase-producing Enterobacteriaceae (ESBL-E) or carbapenemase-producing Enterobacteriaceae (CPE). 1,482 patients in 12 countries were included from an observational study of BSI caused by ESBL-E or CPE. Multivariate logistic regression was used to calculate adjusted odds ratios (aORs) for the influence of country of recruitment on empirical use of β-lactam/β-lactamase inhibitors (BLBLI) or carbapenems, targeted use of BLBLI for ESBL-E and use of targeted combination therapy for CPE...
August 3, 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/28743946/identification-of-the-eskape-pathogens-by-mass-spectrometric-analysis-of-microbial-membrane-glycolipids
#7
Lisa M Leung, William E Fondrie, Yohei Doi, J Kristie Johnson, Dudley K Strickland, Robert K Ernst, David R Goodlett
Rapid diagnostics that enable identification of infectious agents improve patient outcomes, antimicrobial stewardship, and length of hospital stay. Current methods for pathogen detection in the clinical laboratory include biological culture, nucleic acid amplification, ribosomal protein characterization, and genome sequencing. Pathogen identification from single colonies by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS) analysis of high abundance proteins is gaining popularity in clinical laboratories...
July 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28739789/contribution-of-tetb-efflux-pump-on-minocycline-susceptibility-among-carbapenem-resistant-acinetobacter-baumannii
#8
Peng Wang, Christi L McElheny, Roberta T Mettus, Robert M Q Shanks, Yohei Doi
Minocycline, a semi-synthetic tetracycline developed in the 1970s, has become an important treatment option against MDR A. baumannii infections, particularly those caused by carbapenem-resistant strains (1).….
July 24, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28739785/emergence-of-mcr-1-in-raoultella-ornithinolytica-and-escherichia-coli-from-retail-vegetables-china
#9
Juan Luo, Xu Yao, Luchao Lv, Yohei Doi, Xiuyu Huang, Sicheng Huang, Jian-Hua Liu
The presence of mcr-1 among Enterobacteriaceae isolates collected from retail vegetables in China between 2015 and 2016 were investigated. Two Raoultella ornithinolytica and seven Escherichia coli strains recovered from lettuce and tomato samples were identified as MCR-1-producers. Similar to isolates from animals and humans, the mcr-1 gene was located on the IncHI2/ST3, IncI2 or IncX4 plasmids. The presence of MCR-1-producing organisms in ready-to-eat food samples represents a serious risk for human health...
July 24, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28587061/enhanced-osseointegration-of-a-modified-titanium-implant-with-bound-phospho-threonine-a-preliminary-in-vivo-study
#10
Yohei Okazaki, Kazuya Doi, Yoshifumi Oki, Reiko Kobatake, Yasuhiko Abe, Kazuhiro Tsuga
Implant surface topography is a key factor in achieving osseointegration. l-Threonine can be chemically and stably bonded to titanium surfaces by phosphorylation. This study investigated the degree of in vivo osseointegration of an implant with a novel o-phospho-l-threonine (p-Thr)-binding surface. MC3T3-E1 cells were seeded on the p-Thr binding surface and machined surface disks, and initial cell attachment was evaluated. p-Thr-binding and machined surface implants were tested in vivo by implantation into the femurs of three male New Zealand white rabbits, and the osseointegration was assessed by measurement of removal torque (RT) and bone-implant contact (BIC) ratio...
May 25, 2017: Journal of Functional Biomaterials
https://www.readbyqxmd.com/read/28567443/correction-for-miyoshi-akiyama-et-al-comparative-genome-analysis-of-extended-spectrum-%C3%AE-lactamase-producing-escherichia-coli-sequence-type-131-strains-from-nepal-and-japan
#11
Tohru Miyoshi-Akiyama, Jatan Bahadur Sherchan, Yohei Doi, Maki Nagamatsu, Jeevan B Sherchand, Sarmila Tandukar, Norio Ohmagari, Teruo Kirikae, Hiroshi Ohara, Kayoko Hayakawa
[This corrects the article DOI: 10.1128/mSphere.00289-16.].
May 2017: MSphere
https://www.readbyqxmd.com/read/28559250/ceftazidime-avibactam-is-superior-to-other-treatment-regimens-against-carbapenem-resistant-klebsiella-pneumoniae-bacteremia
#12
Ryan K Shields, M Hong Nguyen, Liang Chen, Ellen G Press, Brian A Potoski, Rachel V Marini, Yohei Doi, Barry N Kreiswirth, Cornelius J Clancy
There are no data comparing outcomes of patients treated with ceftazidime-avibactam versus comparators for carbapenem-resistant Enterobacteriaceae infections. At our center, ceftazidime-avibactam treatment of carbapenem-resistant Klebsiella pneumoniae bacteremia was associated with higher rates of clinical success (P = 0.006) and survival (P = 0.01) than other regimens. Across treatment groups, there were no differences in underlying diseases, severity of illness, source of bacteremia, or strain characteristics (97% produced K...
August 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28555943/pro-angiogenic-tie-2-expressing-monocytes-tems-as-a-biomarker-of-the-effect-of-sorafenib-in-patients-with-advanced-hepatocellular-carcinoma
#13
MULTICENTER STUDY
Hirotaka Shoji, Sachiyo Yoshio, Yohei Mano, Hiroyoshi Doi, Masaya Sugiyama, Yosuke Osawa, Kiminori Kimura, Taeang Arai, Norio Itokawa, Masanori Atsukawa, Yoshihiko Aoki, Moto Fukai, Akinobu Taketomi, Masashi Mizokami, Tatsuya Kanto
Sorafenib, a multi-kinase inhibitor, inhibits tumor angiogenesis and is the first-line systemic therapy for patients with advanced hepatocellular carcinoma (HCC). However, due to its limited effects and frequent occurrence of side effects, biomarkers are needed to predict the effects of sorafenib. We considered the possibility of using TIE-2-expressing monocytes (TEMs) to predict the response in sorafenib-treated patients with advanced HCC. TEMs serve as a diagnostic marker of HCC and are related to angiogenesis...
September 1, 2017: International Journal of Cancer. Journal International du Cancer
https://www.readbyqxmd.com/read/28523191/maternal-morbidity-in-women-with-placenta-previa-managed-with-prediction-of-morbidly-adherent-placenta-by-ultrasonography
#14
Midori Fujisaki, Seishi Furukawa, Yohei Maki, Masanao Oohashi, Koutarou Doi, Hiroshi Sameshima
Objective. To determine maternal morbidity in women with placenta previa managed with prediction of morbidly adherent placenta (MAP) by ultrasonography. Methods. A retrospective cohort study was undertaken comprising forty-one women who had placenta previa with or without risk factors for MAP. Women who had all three findings (bladder line interruption, placental lacunae, and absence of the retroplacental clear zone) were regarded as high suspicion for MAP and underwent cesarean section followed by hysterectomy...
2017: Journal of Pregnancy
https://www.readbyqxmd.com/read/28521000/the-ecology-of-extended-spectrum-%C3%AE-lactamases-esbls-in-the-developed-world
#15
Yohei Doi, Alina Iovleva, Robert A Bonomo
Background: Since the initial appearance in the 1980s, Enterobacteriaceae producing extended-spectrum β-lactamase (ESBL) have increased in prevalence and emerged as a major antimicrobial-resistant pathogen. The source of these antimicrobial-resistant bacteria in the developed world is an area of active investigation. Methods: A standard internet search was conducted with a focus on the epidemiology and potential sources of ESBL-producing Enterobacteriaceae in the developed world...
April 1, 2017: Journal of Travel Medicine
https://www.readbyqxmd.com/read/28457352/carbapenem-resistant-enterobacteriaceae
#16
REVIEW
Alina Iovleva, Yohei Doi
Carbapenem-resistant Enterobacteriaceae (CRE) have emerged as a major threat. Commonly used antibiotics are generally inactive against CRE. Therefore, timely detection of CRE is of paramount importance. Among CRE, those producing carbapenem-hydrolyzing β-lactamase enzymes (carbapenemase-producing Enterobacteriaceae) are particularly of concern because they tend to spread, and treatment is difficult. The carbapenemase groups most commonly encountered include KPC, NDM, and OXA-48. Treatment options are limited and include combinations of polymyxins, tigecycline, aminoglycosides, or carbapenems; newer agents with activity against CRE and better safety profiles are becoming available and will likely emerge as the preferred therapy...
June 2017: Clinics in Laboratory Medicine
https://www.readbyqxmd.com/read/28442293/effect-of-appropriate-combination-therapy-on-mortality-of-patients-with-bloodstream-infections-due-to-carbapenemase-producing-enterobacteriaceae-increment-a-retrospective-cohort-study
#17
Belén Gutiérrez-Gutiérrez, Elena Salamanca, Marina de Cueto, Po-Ren Hsueh, Pierluigi Viale, José Ramón Paño-Pardo, Mario Venditti, Mario Tumbarello, George Daikos, Rafael Cantón, Yohei Doi, Felipe Francisco Tuon, Ilias Karaiskos, Elena Pérez-Nadales, Mitchell J Schwaber, Özlem Kurt Azap, Maria Souli, Emmanuel Roilides, Spyros Pournaras, Murat Akova, Federico Pérez, Joaquín Bermejo, Antonio Oliver, Manel Almela, Warren Lowman, Benito Almirante, Robert A Bonomo, Yehuda Carmeli, David L Paterson, Alvaro Pascual, Jesús Rodríguez-Baño
BACKGROUND: The best available treatment against carbapenemase-producing Enterobacteriaceae (CPE) is unknown. The objective of this study was to investigate the effect of appropriate therapy and of appropriate combination therapy on mortality of patients with bloodstream infections (BSIs) due to CPE. METHODS: In this retrospective cohort study, we included patients with clinically significant monomicrobial BSIs due to CPE from the INCREMENT cohort, recruited from 26 tertiary hospitals in ten countries...
July 2017: Lancet Infectious Diseases
https://www.readbyqxmd.com/read/28438937/incx2-and-incx1-x2-hybrid-plasmids-coexisting-in-a-fosa6-producing-escherichia-coli-strain
#18
Qinglan Guo, Jiachun Su, Christi Lee McElheny, Nicole Stoesser, Yohei Doi, Minggui Wang
IncX plasmids are receiving much attention as vehicles of carbapenem and colistin resistance genes, such as blaNDM, blaKPC, and mcr-1 Among them, IncX2 subgroup plasmids remain rare. Here, we characterized IncX2 and IncX1-X2 hybrid plasmids coexisting in a FosA6-producing Escherichia coli strain that were possibly generated as a consequence of recombination events between an R6K-like IncX2 plasmid and a pLN126_33-like IncX1 plasmid. Variable multidrug resistance mosaic regions were observed in these plasmids, indicating their potential to serve as flexible carriers of resistance genes...
July 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28418308/chromosomal-16s-ribosomal-rna-methyltransferase-rmte1-in-escherichia-coli-sequence-type-448
#19
Bin Li, Marissa P Pacey, Yohei Doi
We identified rmtE1, an uncommon 16S ribosomal methyltransferase gene, in an aminoglycoside- and cephalosporin-resistant Escherichia coli sequence type 448 clinical strain co-harboring blaCMY-2. Long-read sequencing revealed insertion of a 101,257-bp fragment carrying both resistance genes to the chromosome. Our findings underscore E. coli sequence type 448 as a potential high-risk multidrug-resistant clone.
May 2017: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/28407091/brassinosteroid-involvement-in-arabidopsis-thaliana-stomatal-opening
#20
Shin-Ichiro Inoue, Nozomi Iwashita, Yohei Takahashi, Eiji Gotoh, Eiji Okuma, Maki Hayashi, Ryohei Tabata, Atsushi Takemiya, Yoshiyuki Murata, Michio Doi, Toshinori Kinoshita, Ken-Ichiro Shimazaki
Stomata within the plant epidermis regulate CO2 uptake for photosynthesis and water loss through transpiration. Stomatal opening in Arabidopsis thaliana is determined by various factors, including blue light as a signal and multiple phytohormones. Plasma membrane transporters, including H+-ATPase, K+ channels and anion channels in guard cells, mediate these processes, and the activities and expression levels of these components determine stomatal aperture. However, the regulatory mechanisms involved in these processes are not fully understood...
June 1, 2017: Plant & Cell Physiology
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